Electroysis rust removal:
After doing some research about how to remove rust inside the gas tank I ended up using electrolysis removal as an option I wanted to try. If you take a google search about the topic you will find different recipe and procedures.
Baking soda is not good. It’s not the same as washing soda.
Can be used:
Citric acid can work but is not the best option.
Best in test:
Washing soda gives the best result. Use about 200-300g mixed with hot water and fill up the tank to the edge.
Washing soda is also the same as crystal soda.
How to do it ?
See the pictures below and click on the images for a better view. You can use a battery,or as I did, an adjustable power supply to control the voltage and current. Connect the minus pole to the tank ( remove some paint to get connection to the steel ). Use a piece of steel as anode and dip it into the solution. Keep clear from the tank, use a non coductive material to isolate as shown on the images. After some hours the andode must be cleaned to keep the current going. Pour water into the tank to keep the level at the top. When the anode is clean and the voltage is around 20-30V, the current can be 2-3 A. After some hours the current will drop and you have to clean the anode or let the process run for a longer period of time.
The GT750 tank below had very little rust from start of. I run the process one time for about 8 hours.
The anode after 8 hours:
Make sure the anode is not in contact with any metal in the tank. If it does, the voltage will be shorted.
The GT380 tank was much worse from start of and had a lot of rust. I let the process run over night, cleaned the anode and ran it once more for about 8 hours.
And no, this will not damage your tank. If you swap the plus and minus, then….. it’s game over.
This recipe is probably the most gentle way of removing rust from your MC gas tank.